$x^2-4x=30$
$sinx\:sin\:\left(\:x+y\right)+\:cos\:x\:cos\:\left(\:x+y\right)=cos\:y$
$5\:+20\cdot5$
$y^2-\frac{9}{y}+3$
$\left(x^2+2\right)\sqrt[2]{5+3x}$
$\left(e^{2x}\right)\left(4x+10\right)$
$9x^6+12x^4-4x^2$
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